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[johnzjq <>]

I convert the obj file to off file:
http://cgal-discuss.949826.n4.nabble.com/file/n3081403/1.off 1.off 

Here is the code:
#include <CGAL/Cartesian.h>
#include <CGAL/Gmpq.h>
#include <CGAL/Polyhedron_3.h>
#include <CGAL/IO/Polyhedron_iostream.h>
#include <fstream>
typedef CGAL::Cartesian<CGAL::Gmpq> kernal;
typedef CGAL::Polyhedron_3<kernal,My_items> Polyhedron_3;

int _tmain(int argc, _TCHAR* argv[])
{
              //IO
        std::ifstream iFile;
        iFile.open("c:\\1.off");
        if (!iFile.is_open())
        {
            std::cerr<<"Error opening file";
        }
        Polyhedron_3 P;
        iFile >> P;
        iFile.close();
        //Convexhull
        Polyhedron_3 ch_obj;
        CGAL::convex_hull_3(P.points_begin(),P.points_end(),ch_obj);
}

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